(509d) Highly Efficient Visible Light Photocatalytic Production of H2

Authors: 
Hu, Y. H., Michigan Technological University
Intensive effort has been made to develop photocatalytic processes to convert solar energy to clean fuels. So far, however, energy conversion efficiency for the visible-light photocatalytic splitting of water to hydrogen is less than 1%. In this talk, I will highlight recent findings for visible light photocatalysis in my group, including: (1) demonstrating that surface-diffuse-reflected-light can be 2 orders of magnitude more efficient than incident light for photocatalysis, (2) revealing that the inefficiency of absorbed visible light for the photocatalytic H2 production from water with a sacrificial agent is due to its kinetic limitation, and (3) inventing a novel temperature-induced visible light photocatalytic H2 production from water steam with a sacrificial agent to reach a high photohydrogen yield of 497 mmol/h/gcat with a large apparent quantum efficiency (QE) of 65.7% for entire visible light range.